How long have astronomers studied the planets and other obje

How long have astronomers studied the planets and other objects in space?

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直线Z的方程为X-Y-2=0,它关于点(1,-4)的对称直线方程为 ( )

直线Z的方程为X-Y-2=0,它关于点(1,-4)的对称直线方程为 ( ) A.X+Y-8=0 B.X+Y-12=0 C.X+Y+12=0 D.X+Y+8=0

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